/* libSoX file format: null   (c) 2006-8 SoX contributors * Based on an original idea by Carsten Borchardt * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or (at * your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser * General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA */ #include "sox_i.h"#include <string.h> static int startread(sox_format_t * ft){  if (!ft->signal.rate) {    ft->signal.rate = SOX_DEFAULT_RATE;    lsx_report("sample rate not specified; using %g", ft->signal.rate);  }  ft->signal.precision = ft->encoding.bits_per_sample?      ft->encoding.bits_per_sample: SOX_SAMPLE_PRECISION;  /* Default number of channels is application-dependent */  return SOX_SUCCESS;} static size_t read_samples(sox_format_t * ft, sox_sample_t * buf, size_t len){  /* Reading from null generates silence i.e. (sox_sample_t)0. */  USED(ft);  memset(buf, 0, sizeof(sox_sample_t) * len);  return len; /* Return number of samples "read". */} static size_t write_samples(    sox_format_t * ft, sox_sample_t const * buf, size_t len){  /* Writing to null just discards the samples */  USED(ft); USED(buf);  return len; /* Return number of samples "written". */} LSX_FORMAT_HANDLER(nul){  static const char * const names[] = {"null", NULL};  static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE,    NULL, names, SOX_FILE_DEVICE | SOX_FILE_PHONY | SOX_FILE_NOSTDIO,    startread, read_samples,NULL,NULL, write_samples,NULL,NULL, NULL, NULL, 0  };  return &handler;}